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2019 Holden Commodore is vibrating at idle

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My 2019 Holden Commodore ZB LT is vibrating at idle. This happens especially on first start or if it has not been started for a while. The car has been serviced regularly. It has also had the spark plugs changed and a carbon engine clean done. I’m also getting high fuel consumption.

First thoughts would be that you have a fuel injector that is not spraying either the correct amount of fuel and/or in the correct pattern for proper combustion. This will certainly bring on the symptoms you’re seeing, as well as ruining fuel economy. It’s also most likely to show up if the engine has been sitting for a while.

But the reality is that a modern engine like this one has literally hundreds of electronic sensors and systems that can all add up to poor running and economy. The best bet is to have the car scanned to see if the on-board computer has logged any faults. Without this intelligence, you’re flying blind, replacing parts that may or may not fix the problem.

Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.

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